Move fastboot specific config to a meta tag; keep manifest in

package.json for broccoli-asset-rev support

This commit builds fastboot specific config (available via
FastBoot.config()) to meta tag, which will be extracted by fastboot
when served.

The fastboot config meta has the name ending with
"config/fastboot-environement" to distinguish from regular
"config/environement" meta tags. If the new meta tags are not found,
which happens in embroider builds, we fallback to find regular meta
tags.

Author: xg-wang

packages/ember-cli-fastboot/lib/broccoli/fastboot-config.js

@@ -182,7 +182,9 @@ module.exports = class FastBootConfig extends Plugin {
           moduleWhitelist: this.moduleWhitelist,
           schemaVersion: LATEST_SCHEMA_VERSION,
           hostWhitelist: this.normalizeHostWhitelist(),
-          config: this.fastbootConfig,
+          // We can't drop manifest until broccoli-asset-rev also supports v5 HTML based manifest
+          // https://github.com/ember-cli/broccoli-asset-rev/blob/78f6047c15acb3bd348611f658b03bdd1041911f/lib/fastboot-manifest-rewrite.js
+          manifest: this.manifest,
           htmlEntrypoint: this.manifest.htmlFile
         }
       },

packages/ember-cli-fastboot/lib/broccoli/html-writer.js

@@ -12,6 +12,7 @@ module.exports = class BasePageWriter extends Filter {
     });
     this._manifest = manifest;
     this._rootURL = getRootURL(fastbootConfig, appName);
+    this._fastbootConfig = fastbootConfig;
     this._appJsPath = outputPaths.app.js;
     this._expectedFiles = expectedFiles(outputPaths);
   }
@@ -24,15 +25,46 @@ module.exports = class BasePageWriter extends Filter {
 
   processString(content) {
     let dom = new JSDOM(content);
+    this._handleConfig(dom);
+    this._handleScripts(dom);
+    return dom.serialize();
+  }
+
+  _handleConfig(dom) {
+    function findFistConfigMeta(dom) {
+      let metaTags = dom.window.document.querySelectorAll('meta');
+      for (let element of metaTags) {
+        let name = element.getAttribute('name');
+        if (name && name.endsWith('/config/environment')) {
+          return element;
+        }
+      }
+    }
+    let firstConfigMeta;
+    if (firstConfigMeta) {
+      firstConfigMeta = findFistConfigMeta(dom);
+    } else {
+      firstConfigMeta = dom.window.document.createTextNode('\n');
+      dom.window.document.head.appendChild(firstConfigMeta);
+    }
+    let nodeRange = new NodeRange(firstConfigMeta);
+    for (let [name, options] of Object.entries(this._fastbootConfig)) {
+      nodeRange.insertJsonAsMetaTag(`${name}/config/fastboot-environment`, options);
+    }
+  }
+
+  _handleScripts(dom) {
     let scriptTags = dom.window.document.querySelectorAll('script');
 
     this._ignoreUnexpectedScripts(scriptTags);
 
     let fastbootScripts = this._findFastbootScriptToInsert(scriptTags);
     let appJsTag = findAppJsTag(scriptTags, this._appJsPath, this._rootURL);
-    insertFastbootScriptsBeforeAppJsTags(fastbootScripts, appJsTag);
+    if (!appJsTag) {
+      throw new Error('ember-cli-fastboot cannot find own app script tag');
+    }
 
-    return dom.serialize();
+    insertFastbootScriptsBeforeAppJsTags(fastbootScripts, appJsTag);
   }
 
   _findFastbootScriptToInsert(scriptTags) {
@@ -79,6 +111,10 @@ function getRootURL(appName, config) {
 }
 
 function urlWithin(candidate, root) {
+  // this is a null or relative path
+  if (!candidate || !candidate.startsWith('/')) {
+    return candidate;
+  }
   let candidateURL = new URL(candidate, 'http://_the_current_origin_');
   let rootURL = new URL(root, 'http://_the_current_origin_');
   if (candidateURL.href.startsWith(rootURL.href)) {
@@ -114,6 +150,18 @@ class NodeRange {
     let newTag = this.end.ownerDocument.createElement('fastboot-script');
     newTag.setAttribute('src', src);
     this.insertNode(newTag);
+    this.insertNewLine();
+  }
+
+  insertJsonAsMetaTag(name, content) {
+    let newTag = this.end.ownerDocument.createElement('meta');
+    newTag.setAttribute('name', name);
+    newTag.setAttribute('content', encodeURIComponent(JSON.stringify(content)));
+    this.insertNode(newTag);
+    this.insertNewLine();
+  }
+
+  insertNewLine() {
     this.insertNode(this.end.ownerDocument.createTextNode('\n'));
   }
 

packages/fastboot/src/fastboot-schema.js

@@ -79,8 +79,7 @@ function loadConfig(distPath) {
     ({ appName, config, html, scripts } = loadManifest(distPath, pkg.fastboot, schemaVersion));
   } else {
     appName = pkg.name;
-    config = pkg.fastboot.config;
-    ({ html, scripts } = htmlEntrypoint(appName, distPath, pkg.fastboot.htmlEntrypoint, config));
+    ({ config, html, scripts } = htmlEntrypoint(appName, distPath, pkg.fastboot.htmlEntrypoint));
   }
 
   let sandboxRequire = buildWhitelistedRequire(

packages/fastboot/src/html-entrypoint.js

@@ -4,11 +4,35 @@ const { JSDOM } = require('jsdom');
 const fs = require('fs');
 const path = require('path');
 
-function htmlEntrypoint(appName, distPath, htmlPath, config = {}) {
+function htmlEntrypoint(appName, distPath, htmlPath) {
   let html = fs.readFileSync(path.join(distPath, htmlPath), 'utf8');
   let dom = new JSDOM(html);
-  let scripts = [];
 
+  function mergeContent(metaElement, config, configName) {
+    let name = metaElement.getAttribute('name');
+    if (name && name.endsWith(configName)) {
+      let content = JSON.parse(decodeURIComponent(metaElement.getAttribute('content')));
+      content.APP = Object.assign({ autoboot: false }, content.APP);
+      config[name.slice(0, -1 * configName.length)] = content;
+      return true;
+    }
+    return false;
+  }
+  let fastbootConfig = {};
+  let config = {};
+  for (let element of dom.window.document.querySelectorAll('meta')) {
+    mergeContent(element, config, '/config/environment');
+    let fastbootMerged = mergeContent(element, fastbootConfig, '/config/fastboot-environment');
+    if (fastbootMerged) {
+      element.remove();
+    }
+  }
+  let isFastbootConfigBuilt = Object.keys(fastbootConfig).length > 0;
+  if (isFastbootConfigBuilt) {
+    config = fastbootConfig;
+  }
+
+  let scripts = [];
   let rootURL = getRootURL(appName, config);
 
   for (let element of dom.window.document.querySelectorAll('script,fastboot-script')) {
@@ -24,7 +48,7 @@ function htmlEntrypoint(appName, distPath, htmlPath, config = {}) {
     }
   }
 
-  return { html: dom.serialize(), scripts };
+  return { config, html: dom.serialize(), scripts };
 }
 
 function extractSrc(element) {

packages/fastboot/test/fastboot-test.js

@@ -455,18 +455,4 @@ describe('FastBoot', function() {
       usedPrebuiltSandbox: true,
     });
   });
-
-  it('htmlEntrypoint works', function() {
-    var fastboot = new FastBoot({
-      distPath: fixture('html-entrypoint'),
-    });
-
-    return fastboot
-      .visit('/')
-      .then(r => r.html())
-      .then(html => {
-        expect(html).to.match(/Welcome to Ember/);
-        expect(html).to.not.match(/fastboot-script/);
-      });
-  });
 });